Formula for impedance in electronics (RL RLC & LC circuit)

Impedance is a frequently used term in electronics and physics. We already have discussed the resistance of a conductor in another article. Impedance is almost the same as resistance. But there are some differences in the presentation of impedance. In this article, we are going to discuss the definition, units and formula for impedance in … Read more

Combination of resistors in series and parallel connection

Suppose you have two carbon resistors of 2 ohms each, but you need 1 ohm resistance to connect in a circuit. What will you do if there are no other sources to collect a resistor of resistance 1 ohm? Again, what will you do if you need 4 ohms to use? Yes, we need to … Read more

MCQ on current electricity for class 12 CBSE PDF

In recent exam pattern of class 8, 10 and 12, MCQ and short questions carry majority marks. In this context multiple choice questions are very much important to secure a good score in exams. Students need to find MCQs from the textbooks. But most of the students fail to gather majority of inside questions. Therefore, … Read more

Expression for drift velocity of free electrons

If an external electric field is applied across a conductor, free electrons move in the conductor. The velocities of all the electrons are not the same at every point in the conductor. Therefore, we need to consider the average value of the velocities of the electrons. It is nothing but the drift velocity. In this … Read more

Kirchhoff’s law of current and voltage (KCL and KVL)

We already know that the Ohm’s law is a fundamental law in current electricity. But, Scientist Kirchhoff has given another two fundamental rules of electricity. With the help of these two rules one can easily find the current, voltage and resistance in an electrical circuit by using nodal analysis and loop analysis methods. In this … Read more

Formula for Ohm’s law of current and Voltage with graph

There are two basic laws of current electricity – one is Ohm’s law and another one is Kirchhoff’s law. Ohm’s law of current electricity gives the simplest relation between the electric current and voltage across a resistance. Kirchhoff’s laws tell us how to calculate electric current and voltage at a junction point or in a … Read more

Verification of Ohm’s Law experiment with data and graph

In the previous article, we discussed Ohm’s Law of current electricity. In this article, we’re going to perform an experiment for the verification of Ohm’s law. This practical verification of Ohm’s law is very important for the students of grades 10 and 12. This is a lab-based experiment to verify Ohm’s law or Ohm’s law … Read more

Electrical components used in electronic & electric circuit

An electrical circuit consists of some electrical components and a source of voltage or current. These circuit components perform all the activities in a circuit. We need to know the function of every circuit component to use these properly in a circuit. Examples of some electrical components are resistors, capacitors, inductors, diodes, transistors etc. In … Read more